Critical Microsoft Vulnerability CVE-2026-24293 Affects Multiple Products

Microsoft has issued security guidance for a critical vulnerability affecting multiple products. Attackers can exploit this flaw remotely without authentication. The vulnerability allows arbitrary code execution with system privileges.

Technical Details

CVE-2026-24293 is a remote code execution vulnerability in the Microsoft Windows Common Log File System Driver. Attackers can exploit the vulnerability by sending specially crafted packets to a targeted system. The flaw exists in how the CLFS driver handles memory objects.

Successful exploitation could allow an attacker to take complete control of an affected system. An attacker could then install programs, view, change, or delete data, and create new accounts with full user rights.

Affected Products

The following Microsoft products are affected:

• Windows 10 Version 21H2 and later
• Windows 11 Version 22H2 and later
• Windows Server 2022
• Windows Server 2019
• Windows Server 2016

CVSS Severity

CVSS Base Score: 9.8 (Critical) CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Mitigation Steps

Microsoft has released security updates to address this vulnerability. Organizations should apply the updates immediately.

Workarounds

If immediate patching is not possible, Microsoft recommends the following workarounds:

1. Enable Windows Defender Exploit Guard
2. Configure Windows Firewall to block CLFS traffic
3. Disable the CLFS service via Group Policy

Update Information

Updates are available through:

• Windows Update
• Microsoft Update Catalog
• Windows Server Update Service (WSUS)

For detailed installation instructions, refer to Microsoft Security Update Guide.

Timeline

• Vulnerability Discovery: October 2025
• Security Bulletin Release: January 2026
• Updates Available: January 12, 2026
• Next Security Tuesday: February 9, 2026

Additional Resources

• Microsoft Security Response Center
• CVE-2026-24293 Details
• Affected Products Documentation

Organizations should prioritize patching systems exposed to the internet. The vulnerability is being actively exploited in the wild. Microsoft urges customers to apply updates as soon as possible.